{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73494","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-12T19:00:33.735Z","datePublished":"2026-09-14T17:33:49.671Z","dateUpdated":"2026-09-14T20:05:52.181Z"},"containers":{"cna":{"title":"blaze: Multiple HTTP/1.1 request-smuggling primitives in blaze's Java wire parser","problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/http4s/blaze/security/advisories/GHSA-mhvj-jhpq-885v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/http4s/blaze/security/advisories/GHSA-mhvj-jhpq-885v"},{"name":"https://github.com/http4s/blaze/commit/3f7c022e306631b006dcb43a1d7f65c0d1966f17","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/commit/3f7c022e306631b006dcb43a1d7f65c0d1966f17"},{"name":"https://github.com/http4s/blaze/commit/4eec2007806aa9acfefb00ebb636ddc39a147a96","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/commit/4eec2007806aa9acfefb00ebb636ddc39a147a96"},{"name":"https://github.com/http4s/blaze/commit/927b67753a78c13c4445dac9307f511f5c4878c3","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/commit/927b67753a78c13c4445dac9307f511f5c4878c3"},{"name":"https://github.com/http4s/blaze/commit/a54bc9cd31758335c7f24e29763622fd03fcf734","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/commit/a54bc9cd31758335c7f24e29763622fd03fcf734"},{"name":"https://github.com/http4s/blaze/commit/c47d9675f87603f11b32a11d503626bdf9be5c7a","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/commit/c47d9675f87603f11b32a11d503626bdf9be5c7a"},{"name":"https://github.com/http4s/blaze/commit/e871ebb1d27f50c98fd56988526ce42d0fee74d6","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/commit/e871ebb1d27f50c98fd56988526ce42d0fee74d6"},{"name":"https://github.com/http4s/blaze/releases/tag/v0.23.18","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/releases/tag/v0.23.18"},{"name":"https://github.com/http4s/blaze/releases/tag/v1.0.0-M42","tags":["x_refsource_MISC"],"url":"https://github.com/http4s/blaze/releases/tag/v1.0.0-M42"}],"affected":[{"vendor":"http4s","product":"blaze","versions":[{"version":"< 0.23.18","status":"affected"},{"version":">= 1.0.0-M1, < 1.0.0-M42","status":"affected"}]},{"vendor":"org.http4s","product":"blaze-http_2.13","versions":[{"version":"< 0.23.18","status":"affected"},{"version":">= 1.0.0-M1, < 1.0.0-M42","status":"affected"}]},{"vendor":"org.http4s","product":"blaze-http_3","versions":[{"version":"< 0.23.18","status":"affected"},{"version":">= 1.0.0-M1, < 1.0.0-M42","status":"affected"}]},{"vendor":"org.http4s","product":"http4s-blaze-server_2.13","versions":[{"version":"< 0.23.18","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-14T17:33:49.671Z"},"descriptions":[{"lang":"en","value":"blaze is a Scala library for building asynchronous pipelines, with a focus on network IO. Prior to 0.23.18 and from 1.0.0-M1 until 1.0.0-M42, five HTTP/1.1 conformance laxities in the hand-written Java parser under http/src/main/java/org/http4s/blaze/http/parser/ can cause blaze to derive a different request boundary than a stricter fronting intermediary. A default BlazeServerBuilder accepts invalid or valueless header field names that violate tchar syntax, obsolete folded field lines (obs-fold), unsupported Transfer-Encoding values, duplicate Content-Length fields, and requests containing both Transfer-Encoding and Content-Length. If a lenient or legacy proxy forwards the malformed bytes but interprets them differently, the disagreement can permit front-end authorization bypass, response-queue poisoning on pooled backend connections, or cache poisoning. Exploitation requires a pair of disagreeing parsers; no non-default blaze configuration is required. The affected checks are enforced in BodyAndHeaderParser and Http1ServerParser. This issue is fixed in versions 0.23.18 and 1.0.0-M42."}],"source":{"advisory":"GHSA-mhvj-jhpq-885v","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T19:21:20.842876Z","id":"CVE-2026-73494","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-14T20:05:52.181Z"}}]}}